This versatile integrated circuit will work with many combinations of
logic- and load-voltage levels, meeting interface requirements beyond the
capabilities of standard logic buffers. The UDN2585A and A2585SLW source
drivers can drive incandescent, LED, or vacuum fluorescent displays. Internal
transient-suppression diodes permit the drivers to be used with inductive loads
such as relays, solenoids, dc and stepping motors, and magnetic print ham-
mers.
The UDN2585A and A2585SLW are drivers designed for applications
requiring low output saturation voltages. Typical loads are low-voltage LEDs
and incandescent displays. The eight non-Darlington, 25 V outputs will
simultaneously sustain continuous load currents of -120 mA at ambient
temperatures to +70
C.
These drivers are packaged in plastic DlPs (suffix A) or surface-mount-
able wide-body SOlCs (suffix LW), and are rated for operation over the
temperature range of -20
C to +85
C.
FEATURES
s
TTL, CMOS, PMOS, NMOS Compatible
s
High Output-Current Rating
s
Internal Transient Suppression
s
Efficient Input /Output Structure
s
Through-Hole and Surface-Mount Packages
8-CHANNEL SOURCE DRIVER
Always order by complete part number, e.g., UDN2585A .
Data Sheet
29316E
ABSOLUTE MAXIMUM RATINGS
at 25
C Free-Air Temperature
Output Voltage, V
CE
............................. 25 V
Supply Voltage, V
S
(ref. sub.) .............. 25 V
Input Voltage, V
IN
(ref. V
S
) .................. -20 V
Total Output Current, (l
C
+ I
S
) ........ -250 mA
Substrate Current I
SUB
........................ 2.0 A
Package Power Dissipation, P
D
(single output) ................................ 1.0 W
(total package) ....................... See Graph
Operating Temperature Range,
T
A
................................... -20
C to +85
C
Storage Temperature Range,
T
S
................................. -55
C to +150
C
2585
2585
8-CHANNEL
SOURCE DRIVER
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
2
50
75
100
125
150
2.5
0.5
0
ALLOWABLE PACKAGE POWER DISSIPATION IN WATTS
AMBIENT TEMPERATURE IN
C
2.0
1.5
1.0
25
Dwg. GS-009-1A
SUFFIX 'A', R = 60
C/W
JA
SUFFIX 'LW', R = 90
C/W
JA
W
Copyright 1981, 2002 Allegro MicroSystems, Inc.
TYPICAL OPERATING VOLTAGES
V
S
V
lN(ON)
V
lN(OFF)
V
CC
V
EE(MAX)
Device Types
0 V
-15 V to -3.6 V
-0.5 V to 0 V
NA
-25 V
UDN2585A & A2585SLW
+5 V
0 V to +1.4 V
+4.5 V to +5 V
NA
-20 V
UDN2585A & A2585SLW
+12 V
0 V to +8.4 V
+11.5 V to +12 V
NA
-13 V
UDN2585A & A2585SLW
+15 V
0 V to +11.4 V
+14.5 V to +15 V
NA
-10V
UDN2585A & A2585SLW
NOTE: The substrate must be tied to the most negative point in the external circuit to maintain isolation between drivers and to provide
for normal circuit operation.
For simplification, these devices are characterized on the following pages with
specific voltages for inputs, logic supply (V
S
), load supply (V
EE
), and collector
supply (V
CC
). The more common application of the UDN2585A and A2585SLW
are with positive-referenced logic supplies. In application, the devices are capable
of operation over a wide range of logic and supply voltage levels:
2585
8-CHANNEL
SOURCE DRIVER
www.allegromicro.com
3
UDN2585A and A2585SLW
ELECTRICAL CHARACTERISTICS at T
A
= +25
C, V
S
= 0 V, V
EE
= -20 V (unless otherwise noted).
Limits
Characteristic
Symbol
Test Conditions
Min.
Max.
Units
Output Leakage
I
CEX
V
lN
= -0.5 V, V
OUT
= V
EE
= -25 V
--
50
A
Current
V
lN
= -0.4 V, V
OUT
= V
EE
= -25 V, T
A
= 70
C
--
100
A
Output Sustaining
V
CE(SUS)
V
lN
= -0.4 V, I
OUT
= -25 mA, Note 1
15
--
V
Voltage
Output Saturation
V
CE(SAT)
V
lN
= -4.6 V, I
OUT
= -60 mA
--
1.1
V
V
lN
= -4.6 V, I
OUT
= -120 mA
--
1.2
V
Input Current
I
IN(ON)
V
lN
= -4.6 V, I
OUT
= -120 mA
--
-1.6
mA
V
lN
= -14.6 V, I
OUT
= -120 mA
--
-5.0
mA
Input Voltage
V
IN(ON)
I
OUT
= -120 mA, V
CE
1.2 V, Note 3
--
-4.6
V
V
IN(OFF)
I
OUT
= -100
A, T
A
= 70
C
-0.4
--
V
Clamp Diode
I
R
V
R
= 25 V, T
A
= 70
C
--
50
A
Leakage Current
Clamp Diode
V
F
I
F
= 120 mA
--
2.0
V
Forward Voltage
Input Capacitance
C
IN
--
25
pF
Turn-On Delay
t
PHL
0.5 E
IN
to 0.5 E
OUT
--
5.0
s
Turn-Off Delay
t
PLH
0.5 E
IN
to 0.5 E
OUT
--
5.0
s
NOTES: 1. Pulsed test, t
p
300
s, duty cycle
2%.
2. Negative current is defined as coming out of the specified device pin.
3. The V
IN(ON)
voltage limit guarantees a minimum output source current per the specified conditions.
4. The substrate must always be tied to the most negative point and must be at least 4.0 V below V
S
.
Voltage
Dwg. No. A-11,360
Dwg. PP-064
13
14
15
16
17
19
12
18
20
11
1
2
3
8
9
4
5
6
7
10
NC
NC
SUB/V
EE
SUB
+V
S
UDN2585A
A2585SLW
Dwg. No. A-11,359
PARTIAL SCHEMATIC
2585
8-CHANNEL
SOURCE DRIVER
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
4
TYPICAL APPLICATION
COMMON-CATHODE LED DRIVER
Dwg. No. B-1458A
The products described here are manufactured under one or more
U.S. patents or U.S. patents pending.
Allegro MicroSystems, Inc. reserves the right to make, from time to
time, such departures from the detail specifications as may be
required to permit improvements in the performance, reliability, or
manufacturability of its products. Before placing an order, the user is
cautioned to verify that the information being relied upon is current.
Allegro products are not authorized for use as critical components
in life-support devices or systems without express written approval.
The information included herein is believed to be accurate and
reliable. However, Allegro MicroSystems, Inc. assumes no responsi-
bility for its use; nor for any infringement of patents or other rights of
third parties which may result from its use.
2585
8-CHANNEL
SOURCE DRIVER
www.allegromicro.com
5
UDN2585A
Dimensions in Inches
(controlling dimensions)
Dimensions in Millimeters
(for reference only)
NOTES: 1. Exact body and lead configuration at vendor's option within limits shown.
2. Lead spacing tolerance is non-cumulative.
3. Lead thickness is measured at seating plane or below.
4. Supplied in standard sticks/tubes of 21 devices.
0.014
0.008
0.300
BSC
Dwg. MA-001-18A in
0.430
MAX
18
1
9
0.280
0.240
0.210
MAX
0.070
0.045
0.015
MIN
0.022
0.014
0.100
BSC
0.005
MIN
0.150
0.115
10
0.920
0.880
0.355
0.204
7.62
BSC
Dwg. MA-001-18A mm
10.92
MAX
18
1
9
7.11
6.10
5.33
MAX
1.77
1.15
0.39
MIN
0.558
0.356
2.54
BSC
0.13
MIN
3.81
2.93
10
23.37
22.35
2585
8-CHANNEL
SOURCE DRIVER
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
6
0
TO
8
1
2
3
0.020
0.013
0.0040
MIN.
0.0125
0.0091
0.050
0.016
Dwg. MA-008-20 in
0.050
BSC
20
11
0.2992
0.2914
0.419
0.394
0.5118
0.4961
0.0926
0.1043
0
TO
8
1
20
2
3
0.51
0.33
0.10
MIN.
Dwg. MA-008-20 mm
1.27
BSC
11
0.32
0.23
1.27
0.40
7.60
7.40
10.65
10.00
13.00
12.60
2.65
2.35
A2585SLW
Dimensions in Inches
(for reference only)
Dimensions in Millimeters
(controlling dimensions)
NOTES: 1. Exact body and lead configuration at vendor's option within limits shown.
2. Lead spacing tolerance is non-cumulative.
3. Supplied in standard sticks/tubes of 37 devices or add "TR" to part number for tape and reel.
PDF 
ZIP